[This is Yuffie putting a hand over her heart and reciting an age old promise.]

Cross my heart and hope to...

[Awkward.]

...uh yeah I promise. And I guess I could turn in this thing in.

[She produces the wallet from out of thin air. It's a neat magic trick she's learned at this place. She wants to learn so much more - she can have a second career as magician. ]

Lead the way! I have no idea where the Lost and Found is.